A CO-WORKER HAD POSITIONED A WEAR PLATE ON A WELDING TABLE ACROSS FROM WHERE EMPLOYEE WAS WORKING. THE FIRST EMPLOYEE PROCEEDED TO STRIKE THE PIECE OF WEAR PLATE WITH THE POINTED END OF A WELD ER'S CHIPPING HAMMER TO CHECK FOR HARDNESS. THE POINTED END OF THE HAMMER BROKE OFF, FLEW ACROSS THE TABLE AND EMBEDDED ITSELF INTO THE VICTIM'S FOREARM.